[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

src/compiler/x87/instruction-selector-x87.cc

Index: src/compiler/x87/instruction-selector-x87.cc
diff --git a/src/compiler/x87/instruction-selector-x87.cc b/src/compiler/x87/instruction-selector-x87.cc
index cff4aafb278d8c3d5de8a82fcf2dea54f5f45035..34b53ed7a827817ca431eec4550767d0afdfa303 100644
--- a/src/compiler/x87/instruction-selector-x87.cc
+++ b/src/compiler/x87/instruction-selector-x87.cc
@@ -669,6 +669,12 @@ void InstructionSelector::VisitChangeUint32ToFloat64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
+  X87OperandGenerator g(this);
+  Emit(kX87Float32ToInt32, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitChangeFloat64ToInt32(Node* node) {
   X87OperandGenerator g(this);
   Emit(kX87Float64ToInt32, g.DefineAsRegister(node), g.Use(node->InputAt(0)));